Chain Damage Mechanism And Dynamic Characteristics Analysis Of Long Span Self-anchored Suspension Bridge Under Earthquake

In recent years, many cities attach great importance to structure force reasonable,strong crossing ability, cost savings and the artistic of the bridge etc aspects’ questionsin the process of building bridges, therefore self-anchored suspension has become moreand more popular. But the related research that self-anchored suspension bridge seismicenergy transfer mechanism is less, studying the energy and damage force transmissionmechanism under earthquake has extremely important practical significance. The workis researched and conclusions are following:①Using the theory of disaster chain and medium carrier, researching energy andseismic force’s transmission direction，the transfer process during an earthquakeoccurrence, derivating energy passing’s theoretical formula, quantifying the bridgestructure damage’s judgment standard and the stage division.②Using the world recognizes’s large-scale finite element software ABAQUSestablished that a main span is240m’s JiLin self-anchored suspension bridge’s finiteelement model. Researching the factors of self-anchored suspension bridge’s beamnumber and location change, main tower stiffness change, the space cable systemchange, the main cable tensile stiffness change, arrow cross ratio change, the bridgedeck system mass change, the ratio different of side span and main span, side span withor without suspension bar, the main beam stiffness change, the suspension bar tensilestiffness change etc effect natural vibration characteristics rules.③Analysis getting rules: main tower stiffness’ change has a little effect to naturalvibration frequency, ratio of rise to span、the space cable system、the main cablestiffness’s change has a great effect to natural vibration.④Using time-history analysis method studied on the self-anchored suspensionbridge’s seismic time-history analysis under earthquake, Showing: the traveling wavehas a little effect on structure displacement, has a great effect on structure accelerationand shear;The degree of affecting the North and south is different. Due to theearthquake transmiss from South to North.