普京召年度记会 称欲让俄成为第五经济体

时间:2020-05-25 15:43:18 作者:258369147114 热度:1199℃

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(三)(问)(虎)(门)(大)(桥):(为)(何)(还)(有)(振)(动)(?)(是)(否)(安)(全)(?)(何)(时)(通)(车)(?)|||||||

(()(原)(标)(题)(:)(三)(问)(虎)(门)(大)(桥) (为)(何)(还)(有)(振)(动)(?)(是)(否)(安)(全)(?)(何)(时)(通)(车)(?)())

(三)(问)(虎)(门)(大)(桥):(为)(何)(还)(有)(振)(动)(?)(是)(否)(安)(全)(?)(何)(时)(通)(车)(?)(振)(动)(发)(生)(时)(,)(大)(桥)(管)(理)(部)(门)(正)(在)(进)(行)(悬)(索)(桥)(吊)(索)(更)(换)(养)(护)(,)(在)(大)(桥)(的)(跨)(边)(护)(栏)(设)(置)(了)(水)(马)(()(圈)(内)())(。) (图)(据)(央)(视)

(截)(至)7(日)(上)(午)11(时)(许)(,)(虎)(门)(大)(桥)(仍)(有)(轻)(微)(振)(动)(。)(虎)(门)(大)(桥)(发)(生)(异)(常)(振)(动)(引)(起)(公)(众)(广)(泛)(关)(注)(,)(大)(桥)(为)(何)(振)(动)(?)(是)(否)(安)(全)(?)(何)(时)(恢)(复)(通)(车)(?)(记)(者)(对)(这)(些)(公)(众)(关)(心)(的)(问)(题)(进)(行)(了)(追)(踪)(。)

(大)(桥)(为)(何)(还)(有)(轻)(微)(振)(动)(?)

(虎)(门)(大)(桥)(位)(于)(珠)(江)(口)(狮)(子)(洋)(上)(,)(连)(接)(广)(州)(市)(南)(沙)(区)(和)(东)(莞)(市)(虎)(门)(镇)(,)(是)(粤)(港)(澳)(大)(湾)(区)(一)(条)(重)(要)(的)(跨)(海)(大)(桥)(。)(桥)(面)(双)(向)(六)(车)(道)(,)(主)(跨)(为)888(米)(的)(钢)(箱)(梁)(悬)(索)(桥)(,)(净)(空)(高)(度)60(米)(。)

5(日)(下)(午)(大)(桥)(发)(生)(明)(显)(振)(动)(后)(,)(专)(家)(组)(当)(日)(初)(步)(判)(断)(,)(振)(动)(主)(要)(原)(因)(是)(由)(于)(沿)(桥)(跨)(边)(护)(栏)(连)(续)(设)(置)(水)(马)(,)(改)(变)(了)(钢)(箱)(梁)(的)(气)(动)(外)(形)(,)(在)(特)(定)(风)(环)(境)(条)(件)(下)(,)(产)(生)(了)(桥)(梁)(涡)(振)(现)(象)(。)

(中)(交)(公)(路)(规)(划)(设)(计)(院)(教)(授)(级)(高)(工)(、)(桥)(梁)(专)(家)(吴)(明)(远)(说)(,)(悬)(索)(桥)(的)(截)(面)(是)(流)(线)(型)(的)(,)(而)(大)(量)(设)(置)(的)(水)(马)(使)(得)(流)(线)(型)(的)(钢)(箱)(梁)(钝)(化)(了)(,)(所)(以)(容)(易)(发)(生)(涡)(振)(现)(象)(。)

(记)(者)(采)(访)(了)(解)(到)(,)(振)(动)(发)(生)(时)(,)(大)(桥)(管)(理)(部)(门)(正)(在)(进)(行)(悬)(索)(桥)(吊)(索)(更)(换)(养)(护)(,)(确)(实)(在)(大)(桥)(的)(跨)(边)(护)(栏)(设)(置)(了)(水)(马)(。)(此)(后)(,)(相)(关)(单)(位)(采)(取)(应)(急)(措)(施)(撤)(除)(了)(水)(马)(。)

6(日)(上)(午)10(时)(至)11(时)(许)(,)(记)(者)(在)(距)(离)(虎)(门)(大)(桥)(约)200(米)(的)(江)(岸)(上)(看)(到)(,)(桥)(面)(仍)(有)(振)(动)(,)(肉)(眼)(清)(晰)(可)(见)(。)(为)(何)(在)(水)(马)(撤)(除)(后)(,)(大)(桥)(仍)(有)(振)(动)(?)

(“)(虎)(门)(大)(桥)(悬)(索)(桥)888(米)(这)(么)(长)(的)(主)(跨)(,)(它)(的)(重)(量)(在)1.5(万)(吨)(以)(上)(,)(是)(非)(常)(重)(的)(。)(涡)(振)(产)(生)(以)(后)(,)(它)(的)(阻)(尼)(相)(对)(来)(说)(却)(比)(较)(小)(,)(所)(以)(需)(要)(有)(足)(够)(的)(时)(间)(才)(能)(平)(息)(下)(来)(。)(”)(吴)(明)(远)(说)(。)

(虎)(门)(大)(桥)(副)(总)(工)(程)(师)(张)(鑫)(敏)(打)(了)(个)(比)(方)(,)(这)(就)(像)(一)(根)(很)(粗)(的)(绳)(子)(在)(抖)(动)(一)(样)(,)(荡)(起)(来)(之)(后)(它)(不)(会)(立)(即)(静)(止)(。)

(截)(至)7(日)(上)(午)11(时)(许)(,)(监)(控)(画)(面)(显)(示)(桥)(面)(仍)(有)(轻)(微)(振)(动)(。)

(公)(众)(担)(忧)(:)(大)(桥)(还)(安)(全)(吗)(?)

(虎)(门)(大)(桥)(振)(动)(现)(象)(发)(生)(后)(,)(引)(发)(公)(众)(担)(忧)(:)(桥)(会)(不)(会)(塌)(?)(车)(还)(能)(不)(能)(走)(?)

(广)(东)(省)(交)(通)(集)(团)(有)(限)(公)(司)6(日)(发)(布)(通)(报)(说)(,)(根)(据)(现)(有)(掌)(握)(的)(数)(据)(和)(观)(测)(到)(的)(现)(象)(分)(析)(,)(虎)(门)(大)(桥)(悬)(索)(桥)(结)(构)(安)(全)(,)(此)(次)(振)(动)(不)(会)(影)(响)(虎)(门)(大)(桥)(悬)(索)(桥)(后)(续)(使)(用)(的)(结)(构)(安)(全)(和)(耐)(久)(性)(。)

(吴)(明)(远)(说)(,)(悬)(索)(桥)(会)(有)(两)(种)(震)(动)(,)(一)(种)(是)(影)(响)(行)(车)(舒)(适)(性)(的)(涡)(振)(,)(一)(种)(是)(影)(响)(桥)(梁)(安)(全)(的)(颤)(振)(。)(“)(虎)(门)(大)(桥)(已)(运)(行)23(年)(,)(此)(次)(振)(动)(是)(低)(风)(速)(下)(产)(生)(的)(涡)(振)(。)(”)

(记)(者)(采)(访)(了)(解)(到)(,)5(日)(虎)(门)(大)(桥)(悬)(索)(桥)(桥)(面)(的)(最)(大)(振)(幅)(约)40(厘)(米)(。)(同)(济)(大)(学)(土)(木)(工)(程)(学)(院)(桥)(梁)(工)(程)(系)(教)(授)(葛)(耀)(君)(说)(,)(大)(桥)(有)(监)(测)(涡)(振)(影)(响)(,)(且)(设)(置)(了)(容)(许)(的)(阈)(值)(。)(虎)(门)(大)(桥)(的)(振)(动)(幅)(度)(,)(相)(对)(来)(说)(不)(算)(很)(大)(。)

(历)(史)(上),(美)(国)(塔)(科)(马)(大)(桥)(也)(曾)(出)(现)(过)(振)(动)(,)(最)(后)(造)(成)(了)(桥)(梁)(倒)(塌)(。)(那)(么)(虎)(门)(大)(桥)(涡)(振)(会)(不)(会)(导)(致)(大)(桥)(坍)(塌)(呢)(?)(据)(专)(家)(介)(绍)(,)(两)(座)(桥)(梁)(的)(结)(构)(不)(一)(样)(,)(且)(塔)(科)(马)(大)(桥)(属)(于)(颤)(振)(,)(与)(虎)(门)(大)(桥)(的)(情)(况)(完)(全)(不)(一)(样)(。)

(虎)(门)(大)(桥)(何)(时)(恢)(复)(通)(车)(?)

(在)(此)(次)(因)(振)(动)(而)(备)(受)(关)(注)(前)(,)(虎)(门)(大)(桥)(一)(直)(与)(“)(堵)(车)(”)(联)(系)(在)(一)(起)(。)(作)(为)(连)(接)(珠)(江)(口)(东)(西)(两)(岸)(的)(重)(要)(通)(道)(,)(虎)(门)(大)(桥)(车)(流)(量)(常)(年)(饱)(和)(。)

(记)(者)(获)(得)(的)(一)(份)(材)(料)(显)(示)(,)2018(年)(日)(均)(车)(流)(量)(为)17.52(万)(辆)(标)(准)(车)(次)(,)(为)(设)(计)(饱)(和)(流)(量)(的)2.2(倍)(。)

5(日)(发)(生)(振)(动)(后)(,)(当)(天)(有)(关)(部)(门)(就)(对)(大)(桥)(采)(取)(了)(双)(向)(封)(闭)(临)(时)(管)(制)(措)(施)(。)(截)(至)7(日)15(时)(,)(大)(桥)(仍)(处)(于)(封)(闭)(状)(态)(。)(对)(于)(珠)(三)(角)(的)(众)(多)(车)(主)(而)(言)(,)(人)(们)(很)(关)(心)(大)(桥)(何)(时)(能)(恢)(复)(通)(车)(。)

(记)(者)(在)(采)(访)(中)(了)(解)(到)(,)(参)(与)(大)(桥)(技)(术)(研)(讨)(的)(专)(家)(提)(出)(建)(议)(,)(基)(于)(结)(构)(安)(全)(性)(总)(体)(受)(控)(的)(判)(断)(,)(建)(议)(尽)(早)(恢)(复)(交)(通)(。)

(据)(央)(视)(报)(道)(,)(针)(对)(虎)(门)(大)(桥)(是)(否)(具)(备)(通)(车)(条)(件)(,)(交)(通)(运)(输)(部)(专)(家)(工)(作)(组)(成)(员)(、)(同)(济)(大)(学)(教)(授)(陈)(艾)(荣)(认)(为)(,)(大)(桥)(最)(终)(的)(开)(放)(时)(间)(还)(需)(要)(综)(合)(考)(虑)(各)(种)(因)(素)(,)(需)(要)(保)(持)(稳)(慎)(的)(态)(度)(,)(在)(全)(面)(完)(成)(桥)(梁)(检)(测)(之)(后)(,)(才)(能)(够)(确)(定)(具)(体)(恢)(复)(通)(行)(的)(时)(间)(。)

6(日)(,)(交)(通)(运)(输)(部)(专)(家)(工)(作)(组)(已)(到)(现)(场)(指)(导)(。)(具)(体)(开)(放)(时)(间)(有)(待)(专)(家)(组)(现)(场)(最)(后)(确)(定)(。)

(此)(外)(,)(记)(者)(了)(解)(到)(,)(随)(着)(运)(营)(时)(间)(的)(增)(长)(,)(加)(上)(长)(期)(超)(负)(荷)(运)(行)(,)(管)(养)(单)(位)(已)(准)(备)(对)(虎)(门)(大)(桥)(组)(织)(大)(修)(。)

(延)(伸)(阅)(读)(什)(么)(是)(涡)(振)(?)

(涡)(振)(,)(全)(称)(涡)(激)(振)(动)(,)(起)(因)(是)(风)(流)(过)(物)(体)(截)(面)(后)(,)(在)(物)(体)(背)(后)(产)(生)(周)(期)(性)(的)(漩)(涡)(脱)(落)(,)(由)(此)(产)(生)(对)(结)(构)(的)(周)(期)(性)(强)(迫)(力)(。)

(涡)(振)(是)(一)(种)(限)(幅)(振)(动)(,)(不)(能)(无)(限)(发)(散)(。)(而)(且)(,)(因)(为)(长)(跨)(度)(桥)(梁)(的)(固)(有)(频)(率)(往)(往)(较)(低)(,)(涡)(振)(通)(常)(也)(只)(会)(在)(风)(速)(不)(大)(的)(情)(况)(下)(发)(生)(。)

(延)(伸)(阅)(读) (不)(到)10(天)(一)(连)(两)(座)(悬)(索)(桥)(发)(生)(振)(动) (是)(巧)(合)(吗)(?) (水)(马)(撤)(除)(后)(虎)(门)(大)(桥)(仍)(振)(动) (工)(程)(师)(:)(不)(会)(立)(即)(静)(止) (虎)(门)(大)(桥)(通)(航)(水)(域)(恢)(复)(通)(航) 10(艘)(海)(巡)(船)(加)(强)(组)(织) (韩)(佳)(鹏) (本)(文)(来)(源)(:)(封)(面)(新)(闻) (责)(任)(编)(辑)(:)(韩)(佳)(鹏)_NN984

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